Drawing rotated text in Real Studio has been a problem for a long time now, but I recently added functions for this to our plugins. As of 11.1pr2 (later this week), the Graphics.DrawRotatedTextMBS method draws like this:

Left is Mac and right Windows. As you see Windows does not do antialiasing as nice as Mac, but we'll see if that can be improved over time.
11 05 11 - 14:57